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<p>We aimed to determine which ecological drivers influence fish occupancy in streams from the Upper Paraná River basin. We computed the effects of several ecological drivers (abundance, niche breadth, niche position, range size, range position, distance to the nearest river, body size, origin of species (native vs. exotic), and commercial importance) on occupancy using Generalized Linear Mixed-Effect Models with sub-basin as a random effect. Our analyses showed that the mean local abundance and body size positively influenced fish occupancy in the study area. The origin of species also affected occupancy, with exotic species exhibiting lower occupancy than the native species. The importance of dispersal (as indicated by body size) and the influence of origin on fish occupancy serves as a warning for the studied streams, signaling the potential damage that could arise from changes to the drainage network (e.g., fragmentation and flow alterations) and the presence of specific exotic species, such as <i>Poecilia reticulata</i>.</p>

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Drivers of occupancy patterns of stream fishes in a large neotropical basin

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Omar Loyola-Bartra,
  • Rafaela Vendrametto Granzotti,
  • Victor Lemes Landeiro

摘要

We aimed to determine which ecological drivers influence fish occupancy in streams from the Upper Paraná River basin. We computed the effects of several ecological drivers (abundance, niche breadth, niche position, range size, range position, distance to the nearest river, body size, origin of species (native vs. exotic), and commercial importance) on occupancy using Generalized Linear Mixed-Effect Models with sub-basin as a random effect. Our analyses showed that the mean local abundance and body size positively influenced fish occupancy in the study area. The origin of species also affected occupancy, with exotic species exhibiting lower occupancy than the native species. The importance of dispersal (as indicated by body size) and the influence of origin on fish occupancy serves as a warning for the studied streams, signaling the potential damage that could arise from changes to the drainage network (e.g., fragmentation and flow alterations) and the presence of specific exotic species, such as Poecilia reticulata.